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GeekInterview.com > Interview Questions > Microsoft > ASP.NET 2.0
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Question: Handling events in custom control
Answer: I have created a custom control to get the values and sum them, Here I am able to get display the controls but I am not able to add the values in the text box which means that I am not able to catch the event handling function how is it to be done and
my second question is when I press the sum button the values in the textbox gets erased should I need to set the viewstate property if so how should i do that?
below shown is my code
custom control.cs
Code: ( text )
[DefaultEvent("Click")]
public class WebCustomControl1 : WebControl
{
TextBox value1 = new TextBox();
TextBox value2 = new TextBox();
Label output = new Label();
Button sresult = new Button();
private string showresult;
protected override void CreateChildControls()
{
//base.CreateChildControls();
value1.TextMode = TextBoxMode.SingleLine;
Controls.Add(value1);
Controls.Add(new LiteralControl("
"));
value2.TextMode = TextBoxMode.SingleLine;
Controls.Add(value2);
Controls.Add(new LiteralControl("
"));
sresult.Text = "Show Result";
Controls.Add(sresult);
Controls.Add(new LiteralControl("
"));
Controls.Add(new LiteralControl(" Result: "));
Controls.Add(output);
Controls.Add(new LiteralControl(""));
sresult.Click += new EventHandler(btnsumclicked);
}
public event EventHandler Click;
void btnsumclicked(object sender, EventArgs e)
{
int a = int.Parse(value1.Text) + int.Parse(value2.Text);
showresult = a.ToString();
}
protected virtual void onClick(EventArgs e)
{
if (Click != null)
{
Click(this, e);
}
}
}
In code behind i did not give any thing how should I handle the event in code behind |
| October 10, 2008 04:43:08 |
#1 |
| rajesh550 |
Member Since: July 2008 Total Comments: 1 |
RE: Handling events in custom control
|
| First you may build the control ex Button b = new Button(); b.Text = "ex"; Then you add the button to other control right ? like this.control.add(b); but before add the button (b) to other control, you add the even to the button (b) because its a button, then it will have even onclick, then you add code b.Click +=new EventHandler(b_Click); b_Click is a function or even handler you want to add, if the button (b) clicked. |
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